MFJ MFJ-1925, MFJ-1925I2 User Manual

MFJ-1925 Yaesu Atas 100 Controller

With Icom-706 Control

The MFJ-1925 was designed to control the Yaesu Atas 100 Screwdriver Antenna. This
small unit is an inline switch that gives you up/down control to tune the Atas 100. The
MFJ-1925 puts DC voltage on the center conductor of the coax to control the Atas 100.
The MFJ-1925 also comes with Icom-706 control. The control cable must be connected
to the rear panel of the Icom-706. When the up/down switch is pressed, the Icom-706
will transmit 10 watts CW. When the switch is released, the 706 will return to the
previous mode and power level. The SWR meter on the Icom-706 should be monitored
for an acceptable SWR while tuning the Atas 100.

INSTALLATION

The MFJ-1925 can be easily connected. First, make sure the Icom-706 is turned off. The
RF output from the Icom-706 should be connected to the input, on the bottom-left of the
unit. The output, on the bottom-right, should be connected to the Atas 100.

WARNING: Reversal of the coax connections could damage your Icom-706.

Next, the molded four-conductor plug should be connected to the Tuner Control Jack on
the rear panel of the Icom-706. Mount the MFJ-1925 using the provided Velcro strips.

OPERATION

The Up/Down control should be use when the antenna needs to be tuned. When the
switch is pressed, up or down, the Icom-706 will transmit 10 watts CW. The SWR meter
on the 706 should be observed, while tuning, to achieve an SWR of 1.5 or less.

TECHNICAL ASSISTANCE

If you have any problems with this unit, please read the manual again. If this manual
does not reference your problem or reading the manual does not solve your problem, you
may call MFJ Technical Service at 662-323-0549 or the MFJ Factory at 662-323-5869.
You will best be helped if you have your unit, manual, and all information on your station
handy so you can answer any questions the technicians may ask.

You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road,
Starkville, MS 39759; by FAX to 662-323-6551; or by email to

[e-mail]

explanation of exactly how you are using your unit, and a complete description of you
station.

. Send a complete description of your problem, an